TC74

TC74 Tiny Serial Digital Thermal Sensor Features Digital Temperature Sensing in SOT-23-5 Package Outputs Temperature as an 8-Bit Digital Word Simple Serial Port Interface Solid-State Temperature Sensing: - ±2°C Accuracy from +25°C to +85°C - ±3°C Accuracy from 0°C to +125°C 3.0 and 5.5V Operating Range Low Power: - 200µA Operating - 5µA Standby Mode Applications Thermal Protection for Hard Disk Drives and other PC Peripherals PC Card Devices for Notebook Computers Low Cost Thermostat Controls Power Supplies Thermistor Replacement Package Type TO-220 TC74 12 345 General Description The TC74 is a serially accessible digital temperature sensor particularly suited for low cost and small formfactor applications. Temperature data is converted from the onboard thermal sensing element and made available as an 8-bit digital word. Communication with the TC74 is accomplished via a 2wire SMBus/I2C™ compatible serial port. This bus also can be used to implement multi-drop/multi-zone monitoring. The SHDN bit in the CONFIG register can be used to activate the low power Standby mode. Temperature resolution is 1°C. Conversion rate is a nominal 8 samples/sec. Power consumption is only 200µA typ, (5µA Standby, typ). Small size, low installed cost, and ease of use make the TC74 an ideal choice for implementing thermal management in a variety of systems. Functional Block Diagram Internal Sensor (Diode) ∆∑ Modulator Serial Port Interface Control Logic SDA SCL Temperatur...